javascript - 所选文本在 640 像素或更小的视口(viewport)中逐渐消失

Question

我有一个页面，如果您单击我的代码段中显示的其中一个框，则会显示一个复选标记，并且在您将鼠标移开后，其中显示的内容就好像它是事件的一样。但是，当使用 640 像素或更小的视口(viewport)查看时，框内的文本会在您选择它并选择其他内容后逐渐消失。它不是在普通桌面 View 中执行此操作，那么为什么要使用该特定媒体查询执行此操作？我根本没有对媒体查询中的 .box-focused CSS 进行任何更改，我什至没有包含它，因为我希望一切都一样。

有人知道是什么导致了这种情况发生吗？

$('.project-option-boxes').click(function() {
  $(this).hide().toggleClass('box_focused').fadeIn('slow');
});

#project-scope-container {
	margin-top: 70px;
	margin-left: 9%;
	width: 75%;
	height: 300px;
}
.project-option-boxes {
	display: inline-block;
	border: 1px solid #45ba95;
	padding: 20px 0px;
	margin: 12px 20px 12px 0px;
	width: 30%;
	text-align: center;
	font-size: 1.2em;
	color: #45ba95;
	cursor: pointer;
  transition: ease-in-out .5s;
}
.project-option-boxes:hover {
	background-color: #45ba95;
	color: #FFF;
  transition: ease-in-out .5s;
}
.box_focused {
  background-color: #45ba95;
  color: #FFF;
  background-image : url("http://optimumwebdesigns.com/icons/white_checkmark.png");
  background-position: left center;
  background-repeat: no-repeat;
  background-size: 20px 20px;
  background-position: 5% 50%; 
}
@media screen and (max-width:640px) {
  .project-option-boxes {
	display: block;
	border: 1px solid #45ba95;
	padding: 20px 0px;
	margin: 15px 0px 15px 0px;
	width: 85%;
	text-align: center;
	font-size: 1.2em;
	color: #45ba95;
	cursor: pointer;
}
.project-option-boxes:hover {
	background-color: #45ba95;
	color: #FFF;
}
  
}

<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.1/jquery.min.js"></script>
<div id="project-scope-container">
		<div id="project-scope-title">PROJECT SCOPE</div>
		<div class="project-option-boxes">BRANDING & IDENTITY</div>
		<div class="project-option-boxes">WEB DESIGN</div>
		<div class="project-option-boxes">RESPONSIVE/MOBILE</div>
		<div class="project-option-boxes">MARKETING ASSETS</div>
		<div class="project-option-boxes">HTML5 ANIMATION</div>
		<div class="project-option-boxes">SEO OPTIMIZATION</div>
		<div class="project-option-boxes">MONTHLY SUPPORT</div>
		<div class="project-option-boxes">WEB DEVELOPMENT</div>
		<div class="project-option-boxes">ECOMMERCE</div>
	</div>

Answer 1

您没有为媒体查询中的焦点样式正确设置颜色。请参阅我在下面的媒体查询中添加的 box_focused 类。

$('.project-option-boxes').click(function() {
    $(this).hide().toggleClass('box_focused').fadeIn('slow');
});

#project-scope-container {
    margin-top: 70px;
    margin-left: 9%;
    width: 75%;
    height: 300px;
}

.project-option-boxes {
    display: inline-block;
    border: 1px solid #45ba95;
    padding: 20px 0px;
    margin: 12px 20px 12px 0px;
    width: 30%;
    text-align: center;
    font-size: 1.2em;
    color: #45ba95;
    cursor: pointer;
    transition: ease-in-out .5s;
}

.project-option-boxes:hover {
    background-color: #45ba95;
    color: #FFF;
    transition: ease-in-out .5s;
}

.box_focused {
    background-color: #45ba95;
    color: #FFF;
    background-image : url("http://optimumwebdesigns.com/icons/white_checkmark.png");
    background-position: left center;
    background-repeat: no-repeat;
    background-size: 20px 20px;
    background-position: 5% 50%; 
}

@media screen and (max-width:640px) {
    .project-option-boxes {
        display: block;
        border: 1px solid #45ba95;
        padding: 20px 0px;
        margin: 15px 0px 15px 0px;
        width: 85%;
        text-align: center;
        font-size: 1.2em;
        color: #45ba95;
        cursor: pointer;
    }

    .project-option-boxes:hover, .box_focused {
        background-color: #45ba95;
        color: #FFF;
    }
}

<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.1/jquery.min.js"></script>
<div id="project-scope-container">
    <div id="project-scope-title">PROJECT SCOPE</div>
    <div class="project-option-boxes">BRANDING & IDENTITY</div>
    <div class="project-option-boxes">WEB DESIGN</div>
    <div class="project-option-boxes">RESPONSIVE/MOBILE</div>
    <div class="project-option-boxes">MARKETING ASSETS</div>
    <div class="project-option-boxes">HTML5 ANIMATION</div>
    <div class="project-option-boxes">SEO OPTIMIZATION</div>
    <div class="project-option-boxes">MONTHLY SUPPORT</div>
    <div class="project-option-boxes">WEB DEVELOPMENT</div>
    <div class="project-option-boxes">ECOMMERCE</div>
</div>